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首页> 外文会议>ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference vol.2: Computer Technology; 20050717-21; Denver,CO(US) >FINITE ELEMENT ANALYSIS ON BOLTED FLANGE CONNECTION SUBJECTED TO BENDING MOMENT AND THERMAL LOADS
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FINITE ELEMENT ANALYSIS ON BOLTED FLANGE CONNECTION SUBJECTED TO BENDING MOMENT AND THERMAL LOADS

机译：弯矩和热载荷作用下的法兰连接有限元分析

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摘要

Gasketed flange connections should be designed taking into consideration the actual behavior of the connections under their operating conditions. However, such actual behaviors as the bolt load change, the gasket load change and the flange rotation are not considered in the current design calculation method due to the difficulty to solve a statically indeterminate problem among three bodies, flanges, bolts and gasket. In this paper, the authors perform finite element analyses on a 4 inch bolted flange connection with a spiral wound gasket inserted subjected to the bending moment or the thermal load in addition to the internal pressure. It is taken into consideration the nonlinearity shown in the loading-unloading curve of the gasket. For the bending moments, the gasket contact stress distribution due to the bending moment after pressurizing is evaluated by using a 3-dimensional FE model. The calculated gasket contact stress is compared with the one obtained from the extended load factor method to calculate the behavior of the flange connection subjected to bending moments. The authors propose the extension of the load factor method incorporating with the concept of the conventional equivalent pressure representing the bending moment. For the thermal load, an axisymmetric FE model is utilized to evaluate the changes in the flexibility and the thermal expansions of the flange connection at the elevated temperature. The authors also extend the load factor method to incorporate with the change of the flexibility of the flange connection and the thermal expansion depending on the change of temperature. The results obtained from the extended load factor method are cross-checked with those from the finite element analysis.
机译：垫片法兰连接的设计应考虑到其在工作条件下的实际行为。但是，由于难以解决法兰，螺栓和垫圈这三个主体之间的静态不确定问题，因此在当前的设计计算方法中未考虑螺栓载荷变化，垫圈载荷变化和法兰旋转等实际行为。在本文中，作者对插入有螺旋缠绕垫片的4英寸螺栓法兰连接进行了有限元分析，该垫片承受了弯矩或内部压力之外的热负荷。考虑到垫圈的装卸曲线中显示的非线性。对于弯矩，通过使用三维有限元模型来评估由于加压后的弯矩引起的垫片接触应力分布。将计算出的垫片接触应力与从扩展载荷因子法获得的垫片接触应力进行比较，以计算法兰连接在弯矩作用下的行为。作者提出了结合传统等效压力代表弯矩的概念来扩展载荷因子方法。对于热负荷，轴对称有限元模型用于评估在高温下法兰连接的挠性和热膨胀的变化。作者还扩展了载荷因数方法，以结合法兰连接的挠性变化和取决于温度变化的热膨胀。从扩展载荷因子方法获得的结果与有限元分析的结果进行了交叉检验。

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